A Textbook of Ore Dressing by Robert Hallowell Richards

Author:Robert Hallowell Richards
Language: eng
Format: epub
Publisher: McGraw-Hill
Published: 1909-03-25T05:00:00+00:00

FIG. 213. — SIDE-SHAKE VANNER.

upon the toggles N. Special spring arms can be used instead of toggles. The boxes for the two end rollers are attached to the ends of the longitudinal timbers with bolt slots to allow for adjustment in and out, and set screws for this adjustment. These set screws are used to square the rollers, and to some extent to take up any slack in the belt. They may also be used, on the lower

end roller, to guide the belt, bearing in mind that the latter always runs toward its loosened side. The dipping roller B is hung from long hangers P, the tightening roller C on short ones. In order to withstand the shake of the frame, each pair of hangers is braced by two diagonal rods connecting the two hangers and having lock nuts on each end. The chief means of guiding, as well as of tightening, the belt consists of the hand screws 16, which control the position of the roller C. To guide the belt toward either side of the machine the end of C that is on that side should be moved toward the head of the machine. The tightening roller is shorter than the others and has rounded edges to save the belt flange. At 17 are the lugs by which the guide rods V connect the shaking frame to the main frame. These guide rods have lock nuts at both ends to square the whole shaking frame and to give it longitudinal stability. The bolts that hold the lugs 17 are the same that hold the toggle blocksi at the tail end of the shaking frame and also the boxes for the large tail rolier. Similarly, the bolts that hold the toggle blocks at the head end of the shaking frame also hold the boxes for the large head roller. Twelve small rollers D are mounted upon the shaking frame to support the belt. They are spaced 12 inches apart, except the four upper rollers, which are set closer in order to make a smoother plane where the final cleaning is done. The boxes in which these little rollers run are adjustable in and out, in order to allow the rollers to run easily without rattling. All the rollers, both large and small, are made of galvanized iron. The concentrating plane is that portion of the belt surface that is tangent to the tail roller and the ten little rollers above it. The cleaning plane is that portion of the belt surface that is tangent to the head roller and the three little rollers below it, and with a smooth belt it has a slope that is steeper than that of the concentrating plane by ^^inch in its length of 25 inches, due to the fact that the head roller is elevated i inch above the concentrating plane. With a corrugated belt the head roller is elevated f inch above the concentrating plane. The feed distributor I is fastened to the shaking frame by means of slotted bolt holes, so that its height and slope can be adjusted.

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